Effects of depuration on subsequent deterioration and shelf life of cultured grooved carpet shell clam Ruditapes decussatus during chilled storage

Mota, Fábio; Aníbal, J.; Esteves, Eduardo

Publication

Effects of depuration on subsequent deterioration and shelf life of cultured grooved carpet shell clam Ruditapes decussatus during chilled storage

2019-07Conference object

dc.contributor.author	Mota, Fábio
dc.contributor.author	Aníbal, J.
dc.contributor.author	Esteves, Eduardo
dc.date.accessioned	2019-07-08T20:33:50Z
dc.date.available	2019-07-08T20:33:50Z
dc.date.issued	2019-07
dc.description.abstract	The grooved carpet shell clam Ruditapes decussatus is one of the most consumed and valuable bivalves in the Mediterranean in terms of both nutrition and market. As with other filter-feeding species there are health risks associated with its consumption and specimens have to be depurated pending assessment of water quality of the environment where they originate. The aim of this study was to examine the effects of depuration on parameters of biological (mortality), commercial/physiological (condition index, CI, and percent edibility, PE), physicochemical (pH and TVB-N content), microbiological (TVC, Enterobacteriaceae and psychrotrophic bacteria) and sensory quality of commercially-sized clams from Ria Formosa (Algarve, south Portugal) stored at chill temperatures. In Summer, the season of peak clam’s consumption, the ‘median time to death’ t50 estimated in the two-parameter logistic model fitted to proportion data of alive depurated and non-depurated clams stored chilled (5ºC) for up to 24 days was similar (13±0.12 vs. 12.1±0.06 days). Moreover, t50 of non-depurated, ‘natural’ clams was found to be much lower in Summer compared to Winter (12.1±0.05 vs. 20.1±0.22 days). In depurated clams, CI decreased, and PE increased steadily during storage, whereas CI and PE of non-depurated clams remained constant (55-61% and 18-20% respectively). pH decreased in the first 1-2 days, markedly in non-depurated clams (from ca. 6 to 5) and then gradually increased to values >7 on days 23-24. Concurrently, TVB-N increased exponentially in both depurated and non-depurated clams, exceeding EU limits by day 20. Initial microbial load was fairly low, 2 to 4 log cfu/g. Expectedly, after depuration microorganisms’ abundance decreased, more pronounced (1-2 log cfu/g) in TVC and psychrotrophic bacteria. Subsequently, abundances grew substantially to 5 log cfu/g at day 24. Enterobacteriaceae abundance remained constant till day 20 and then increased sharply. Similar dynamics were found for non-depurated clams but at comparatively higher abundances. In terms of sensory quality, 50% of the panelists rejected the samples (raw and cooked), t50, on days 7-8 of chill storage. Rejection was elicited by marked changes in appearance and odor. Depuration affected in different ways the level but not the general dynamics of the quality parameters assessed during chilled storage of clams. However, eventual safety issues emerge long after habitual storage time and panelists’ sensory rejection.	pt_PT
dc.description.version	info:eu-repo/semantics/publishedVersion	pt_PT
dc.identifier.issn	978-989-8859-75-4
dc.identifier.uri	http://hdl.handle.net/10400.1/12635
dc.language.iso	eng	pt_PT
dc.peerreviewed	yes	pt_PT
dc.publisher	Instituto Superior de Engenharia, Universidade do Algarve	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	pt_PT
dc.subject	R. decussatus	pt_PT
dc.subject	Depuration	pt_PT
dc.subject	Food quality	pt_PT
dc.subject	Chill storage	pt_PT
dc.title	Effects of depuration on subsequent deterioration and shelf life of cultured grooved carpet shell clam Ruditapes decussatus during chilled storage	pt_PT
dc.type	conference object
dspace.entity.type	Publication
oaire.citation.conferencePlace	Faro, Portugal	pt_PT
oaire.citation.startPage	347	pt_PT
oaire.citation.title	XII CIBIA IBEROAMERCAN CONGRESS OF FOOD ENGINEERING. Challenging Food Engineering as a Driver Towards Sustainable Food Processing	pt_PT
person.familyName	Anibal
person.familyName	Esteves
person.givenName	Jaime
person.givenName	Eduardo
person.identifier.ciencia-id	E01D-F785-AB70
person.identifier.ciencia-id	C81D-666A-FF24
person.identifier.orcid	0000-0002-9704-5824
person.identifier.orcid	0000-0002-1872-8185
person.identifier.rid	A-6080-2010
person.identifier.rid	E-9582-2012
person.identifier.scopus-author-id	6506031408
person.identifier.scopus-author-id	7003885183
rcaap.rights	openAccess	pt_PT
rcaap.type	conferenceObject	pt_PT
relation.isAuthorOfPublication	66594510-941f-49ed-86f5-3ef199bc3227
relation.isAuthorOfPublication	aa7fd030-1bcb-4f16-83ad-508346a35f97
relation.isAuthorOfPublication.latestForDiscovery	66594510-941f-49ed-86f5-3ef199bc3227